periodicity

Summary

Summary: The tendency of a phenomenon to recur at regular intervals; in biological systems, the recurrence of certain activities (including hormonal, cellular, neural) may be annual, seasonal, monthly, daily, or more frequently (ultradian).

..The epidemiology is complex with long inter-epidemic intervals and endemic with seasonal fluctuations. This study was initiated to investigate dengue transmission dynamics in Binh Thuan province, southern Vietnam...

..The findings support the view that oscillatory properties of single IO neurons endow the system with important reset dynamics, while gap junctions are mainly required for synchronized neuronal ensemble activity...

Asymmetric transfer of visuomotor learning between discrete and rhythmic movements

..These observations outline the essentials of an Active Sensing paradigm, and argue for increased emphasis on the study of sensory processes as specific to the dynamic motor/attentional context in which inputs are acquired...

Different types of oscillations in Notch and Fgf signaling regulate the spatiotemporal periodicity of somitogenesis

..seasons and identified individuals on their breeding grounds, using photoidentification, to determine breeding periodicity and operational sex ratios. Males returned to breed at least twice as frequently as females...

..Moreover, a matrix of markers based on gait dynamics may be useful in characterizing certain pathologies of motor control and, possibly, in quantitatively monitoring disease progression and evaluating therapeutic interventions...

A novel form of pigment-dispersing hormone in the central nervous system of the intertidal marine isopod, Eurydice pulchra (leach)

..both tidal (activity) and circadian (chromatophore) rhythms, however, there was no evidence for a corresponding periodicity in the expression of pdh transcript, as determined by quantitative reverse transcriptase polymerase chain ..

..The ability of cerebellar cortex to generate population rhythms within the same frequency bands as neocortex suggests that they act as a common spatiotemporal code within which corticocerebellar dialog may occur...

..Despite growing acceptance that biological rhythms profoundly influence energy homeostasis, little is known regarding how the timing of nutrient ingestion influences development of common metabolic diseases...

Stuttering and the basal ganglia circuits: a critical review of possible relations

..Together, these results suggest a surprisingly strong link between the sensory tuning of cortical LFPs and afferent inputs, with important implications for the interpretation of imaging studies and for models of cortical function...

..We conclude that sleep slow oscillation-like excitability changes cannot be actively imposed on the awake cortex with so-tDCS, but phase-independent on-line as well as off-line facilitation can reliably be induced...

Dopamine-dependent changes in the functional connectivity between basal ganglia and cerebral cortex in humans

..These findings suggest that there is execution/observation matching system dysfunction in individuals with autism and that this matching system is related to degree of impairment in imitation abilities...

..Endogenous bursting, in turn, ensures appropriate bursting if the strength of mutual inhibition is weakened and limits the minimum period of the half-center oscillator to a period near that of the single neuron...

Keeping with the beat: movement trajectories contribute to movement timing

..Our findings suggest that the pFRG comprises a neuronal population that is involved in the primary respiratory rhythm generation in the rostrocaudally extending respiratory neuron network of the medulla...

..These results provide neuroscientific evidence that rhythmic arm movement cannot be part of a more general discrete movement system and may require separate neurophysiological and theoretical treatment...

Night-to-night variability of periodic leg movements during sleep in restless legs syndrome and periodic limb movement disorder: comparison between the periodicity index and the PLMS index

..As such, they corroborate previous studies of cortical oscillations in the motor cortex and point to the potential of the combined TMS/EEG approach for further investigations of cortical rhythms in the human brain...

Rumination, negative cognition, and their interactive effects on depressed mood

..These results confirm our hypothesis that CAP slow components are modified by a learning task during the day preceding sleep and support the idea that these components may play a role in sleep-related cognitive processes...

Deformation of network connectivity in the inferior olive of connexin 36-deficient mice is compensated by morphological and electrophysiological changes at the single neuron level

..in auditory cortex of male and female ferrets to artificial vowels of varying fundamental frequency (f(0)), or periodicity, and compared these with the performance of animals trained to discriminate the periodicity of these sounds...

Purinergic modulation of preBötzinger complex inspiratory rhythm in rodents: the interaction between ATP and adenosine

..This high degree of neural overlap between the effects of temporal orienting driven by rhythms and foreperiod effects associated with the passage of time suggests the involvement of a common mechanism for temporal preparation...

Annual, lunar and diel reproductive periodicity of a spawning aggregation of snapper Pagrus auratus (Sparidae) in a marine embayment on the lower west coast of Australia

C B WakefieldWestern Australian Fisheries and Marine Research Laboratories, Department of Fisheries, Government of Western Australia, P O Box 20, North Beach, Western Australia 6920, AustraliaJ Fish Biol 77:1359-78. 2010

..The reproductive cycles of P. auratus described in this study have assisted managers with the appropriate temporal and spatial scale for a closed fishing season to protect these spawning aggregations...

Spike integration and cellular memory in a rhythmic network from Na+/K+ pump current dynamics

..This current also interacted with endogenous Shal K(+) conductances to modulate spike timing for multiple seconds following rhythmic activity, providing a cellular memory of network activity on a behaviorally relevant timescale...

Two different processes for sensorimotor synchronization in continuous and discontinuous rhythmic movements

..Matching results of model simulations give support to a hybrid control model based on optimality, and therefore suggest that optimality principles are applicable to the sensorimotor control of complex movements such as ball bouncing...

Two distinct types of noisy oscillators in electroreceptors of paddlefish

..Thus, the mode of circadian and photic regulation of MAPK phosphorylation varies remarkably among the three subregions within the SCN, suggesting divergent and cell type-specific roles of MAPK in the clock system of the mouse SCN...

..G3, n=20) will be compared to exposure groups using algorithms developed in our laboratory to detect the periodicity and bout structure of spontaneous movements (SM) a putative autonomic probe of arousal regulatory integrity...

..Aim 2 we will determine whether these cell lines display the cardinal clock properties of self-sustained ~24h periodicity, phase shifting by environmental cues, and periods that are essentially invariant at different temperatures, ..

..appear to correspond to single sites or circumscribed zones will be analyzed for common compositional bias, periodicity, fold-back potential, DNA unwinding elements, and conventional sequence motifs to uncover commonalities that ..

..Sleep is controlled by at least two processes: a circadian pacemaker (the clock) ticking with periodicity of ~24 hours, and a homeostatic drive that increases during wakefulness and dissipates during sleep...

..Recent years have produced molecular models of how the circadian clock is built and how it maintains 24-hour periodicity. It is known that the core part of this clockwork is a negative feedback of transcription/translation whereby ..

..translational and post-translational feedback loops (TTFLs) to achieve gene expression with circadian periodicity. We study the components of the biological clock in the prokaryotic cyanobacterium, Synechococcus elongatus, ..

..elegans sleep behavior, which occurs rhythmically with molting rather than with circadian periodicity. We will examine LIN-3 expression for oscillation with the molting cycle, to connect behavior with ..

..clock) that is present in most cells in the body, including neurons and glia, and oscillates with a 24 hour periodicity. In many tissues, circadian clocks serve as master regulators of metabolism, aging, and oxidative stress, ..

..which may contribute substantially to establishing the timing delays necessary to establishing a 24 h molecular periodicity. We have identified a nuclear pore component that slows the circadian clock when absent...

..In a number of vertebrate species, including mammals, there is a transformation from a periodicity coding of the rate of amplitude modulation to an AM filter representation;most neurons in the midbrain respond ..

..It is an illness with pathological disruptions of emotion, cognitive and motor capacity. There is a periodicity of the illness pattern that oscillates between manic energized states with charged emotions and pressured rapid ..

..In a number of vertebrate species, including mammals, there is a transformation from a periodicity coding of the rate of amplitude modulation to an AM filter representation;most neurons in the midbrain respond ..

..data showing that the retina can quickly learn simple patterns in the visual stimulus, such as a temporal periodicity or a smooth motion trajectory, so that a subset of ganglion cells fires selectively after a violation of the ..

..We demonstrated that altered telomere nuclear matrix interactions and nucleosomal periodicity observed in cells derived from individuals with ataxia telangiectasia could be the reason for telomere erosion...

DESCRIPTION: (provided by applicant) The physiology and behavior of virtually all organisms oscillate with a periodicity of approximately 24 h, which is now known to be the result of an endogenous oscillator called the circadian clock...

..Accomplishment of the proposed studies should lead to an increased understanding of the mechanisms of AF at the molecular, cellular and organ levels and may lead to therapeutic advances. [unreadable] [unreadable]..

..of the protein kinase C epsilon isoform from cytosol to myofibrils, and 3) detected disruption of the periodicity of actin staining after repetitive exposure of myocytes to clinically relevant drug concentrations...

..this technology provides a unique means to synthesize biopolymers with sell defined properties such as charge periodicity, molecular weight, and three dimensional structure, and allows for the precise introduction of of informational ..

..and analogous autosomal recessive disease occurs in grey collie dogs whose blood cells oscillate with 14-day periodicity. This group has previously characterized the clinical and physiological features of this disease and its ..

..involves the brain region known to control the timing of sleep/wakefulness, rest/activity and the 24-hour periodicity of nearly all physiologic functions, including the diurnal body temperature cycle...

..3) to test the hypotheses that CAR contains a long polar face that can be disrupted by offsetting helical periodicity via Ala-insertion mutagenesis, and to test (via sulfhydryl-specific site-directed radiolabeling) the sub-..

..In health, approximately 75 percent of secreted insulin is released in discrete pulses with a periodicity of approximately 6 minutes, and modulation of the magnitude of these pulses serves to regulate the insulin ..

..locking at the cochlear hair cell afferent fiber (CHC-AF) synapse, especially when acoustic stimuli occur with periodicity less than 1 ms. We propose to use a variety of experimental preparations from a single species to: 1...

..by a corrected term age, and can be expressed by computer analysis in terms of spectral power, coalescence, and periodicity. These mathematical models reflect the degree of neurophysiological organization of the central nervous system ..